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A044538 Numbers n such that string 2,5 occurs in the base 7 representation of n but not of n+1. 0

%I

%S 19,68,117,139,166,215,264,313,362,411,460,482,509,558,607,656,705,

%T 754,803,825,852,901,979,999,1048,1097,1146,1168,1195,1244,1293,1342,

%U 1391,1440,1489,1511,1538,1587,1636,1685,1734,1783

%N Numbers n such that string 2,5 occurs in the base 7 representation of n but not of n+1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,7],{2,5}]>0,1,0],{n,2000}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 16 2020 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified October 15 21:38 EDT 2021. Contains 348034 sequences. (Running on oeis4.)